#include <iostream>
using namespace std;
// /*
// * comment pairs /* */ cannot nest.
// * ''cannot nest'' is considered source code,
// * as is the rest of the program
// */
int main()
{
    
    cout << "注释是错误的,不能嵌套，但是可以使用单行注释使上述注释无效！" << endl;
    return -1;
}
